EP 1324497 B1 20040929 - Method for self-calibrating a frequency of a modulator circuit, and circuit using said method
Title (en)
Method for self-calibrating a frequency of a modulator circuit, and circuit using said method
Title (de)
Verfahren zur Selbstkalibrierung einer Frequenz einer Modulatorschaltung, und dieses Verfahren anwendende Schaltung
Title (fr)
Procédé d'autocalibration d'une fréquence d'un circuit modulateur, et circuit utilisant ce procédé
Publication
Application
Priority
EP 01830812 A 20011227
Abstract (en)
[origin: EP1324497A1] The present invention relates a method for self-calibrating a frequency of a modulator circuit, said sigma - delta modulator (40) having a go path (15) and a feedback path (19), said go path (15) realized by the series of a resonator circuit (31) and of an analog to digital conversion ADC block (18), said feedback (19) path being realized by a digital to conversion DAC block (19), the inventive method comprising the following succession of steps: a) to apply a pulse (20) in input (IN) to said resonator circuit (31); b) to measure the oscillating frequency of the output signal (4) from said resonator circuit (31) in response of said pulse (20) when the feedback path (19) of said sigma - delta modulator (40) is opened; c) to perform a comparison between said oscillating frequency of said resonator circuit (31) with a frequency (f0) known a priori; d) to modify in a proportional way said oscillating frequency of said resonator circuit (31) in function of said comparison performed at the previous step (c). The inventive circuit has the characteristic that a resonator circuit (31) is composed by at least an integrator filter (16, 17) having on its feedback path a variable gain ("g") amplifier (21), said variable gain ("g") of said amplifier (21) being modified in a proportional way in function of a comparison between the output signal frequency from said resonator circuit (31) due to a pulse (20) response present to its input (IN) and a frequency (f0) known a priori when said feedback path (19) is opened. <IMAGE>
IPC 1-7
IPC 8 full level
H03M 3/00 (2006.01)
CPC (source: EP US)
H03M 3/382 (2013.01 - EP US); H03M 3/406 (2013.01 - EP US); H03M 3/458 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 1324497 A1 20030702; EP 1324497 B1 20040929; DE 60106070 D1 20041104; DE 60106070 T2 20051013; US 2003146862 A1 20030807; US 6822592 B2 20041123
DOCDB simple family (application)
EP 01830812 A 20011227; DE 60106070 T 20011227; US 33113902 A 20021227